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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe17e2869a9b8f6789069cf0dcfbda5d20ecbc051dbe2f76db91c0f7b896f9ef' 
  AND token = 'CZJSWkmzYnr7jyHsB9d4yX6Z6CYbboN2ZU7inK+0rKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}